/**
 
    项目开发时:
     1. 创建项目目录
     2. npm init 初如化项目
         => 项目描述文件 package.json
         => 项目的基本信息
         => 项目依赖的第三方模块
          {
            "name": "manager",
            "version": "1.0.0",
            "description": "manager",
            "main": "index.js",
            "scripts": {
                "test": "echo \"Error: no test specified\" && exit 1"
            },
            "author": "",
            "license": "ISC",

            "dependencies": {
                "jquery": "^3.6.0",
                "mysql": "^2.18.1"
            }
          }
      3.下载安装该项目需要的第三方模块(包)




 */